I have ordered an ETA wicked grapple. They have a 3rd function kit that comes from WR Long company. I got the kit last week and it had the correct brackets etc. It went together easily enough. I'll have the the grapple on Friday so I'm looking forward to a busy weekend. I'll post some pics this weekend for sure.
Does your L4600 have the Kubota SSQA, with two levers?
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This is the one ETA Sells, talked about above: They have a couple Diagrams W.R. Long Valve Kits...Now I'll start reading up on how to install a 3rd function...